Kadru is a dummied enemy in Final Fantasy XV. Final Fantasy XV: The Complete Official Guide lists it as supposed to appear in the main quest Zegnautus Keep, but it is not present in the game. It appears as a Naga with a red and black color scheme.
In the Debug Menu exclusive to the Windows Edition of the game, it can be found and spawned under the name "MF01_501_TOUBYOU" (number 94) as a fully functional enemy as seen on the right. However, because of its dummied status, it is not possible to view it in the bestiary.
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Etymology
In Hindu mythology, according to the Adi Parva of the Mahabharata, Kadru (Kadrū) is usually regarded as the daughter of Daksha.